CVE-2026-102895
GPUStack: Authentication bypass via trusted loopback source (reverse-proxy TCP peer or X-GPUStack-Real-IP header) grants unauthenticated admin
GPUStack is an open-source GPU cluster manager for AI model serving and GPU instance provisioning. Prior to 2.2.0, get_current_user in gpustack/api/auth.py treated a loopback request source as the built-in administrator when force_auth_localhost was false, which was the default. A remote request could appear to originate from 127.0.0.1 because client_ip_getter accepted a same-host reverse proxy peer or a client-supplied X-GPUStack-Real-IP loopback value. The bypass allowed unauthenticated administrative access, including user and model changes, persistent administrator API-key creation, disclosure of worker and cloud-provider secrets, and code execution through POST /v2/inference-backends/from-yaml. Exploitation was observed in the wild against a 2.1.1 deployment. This issue is fixed in version 2.2.0.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| gpustack gpustack |
< 2.2.0 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 9.8 critical |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CNA: GitHub_M |
| 3.1 / 9.8 critical |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/gpustack/gpustack/security/advisories/GHSA-gj9m-f8ph-pmhrCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/gpustack/gpustack/pull/5346CNA: GitHub_M · x_refsource_MISC
- https://github.com/gpustack/gpustack/commit/53f42a6a553542974396d16a4ff6b12bcbedb48dCNA: GitHub_M · x_refsource_MISC
- https://github.com/gpustack/gpustack/releases/tag/v2.2.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/gpustack/gpustack/commit/53f42a6a553542974396d16a4ff6b12bcbedb48d[email protected]
- https://github.com/gpustack/gpustack/pull/5346[email protected]
- https://github.com/gpustack/gpustack/releases/tag/v2.2.0[email protected]
- https://github.com/gpustack/gpustack/security/advisories/GHSA-gj9m-f8ph-pmhr[email protected]
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